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6 typical causes of flies in the home, even in Autumn and Winter!

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When flies buzz through the kitchen or the rest of the apartment, it is usually due to certain reasons. If you eliminate these, you can also contain the plague of flies. Why do flies suddenly “invade” you home? What are the causes of flies? Find out!

Flies are a particularly big nuisance in the home, especially in the hot summer months. Usually it is about the housefly or the greenish iridescent blowflies. But fruit flies can also quickly become a nuisance. In some cases, they can also be a health concern as they can transmit diseases. Just shooing it away is usually not really effective, especially if certain things attract the flies, they’ll come back soon. If they then also lay their eggs in the apartment – and that can be up to 1000 – they will soon no longer be able to be defended against. The best way to prevent an invasion is to address the causes. Find out below the 6 common causes of flies that lead to a sudden invasion.

causes of flies

1. Open groceries in the apartment

Probably the most common cause of flies in the home is when they find food lying around openly. This can be fruit or vegetables in the shell that quickly become mushy and start to smell at the high temperatures. 

Flies are then magically attracted to it. But also chips crumbs on the couch or a leftover fruit juice in the glass are great food. For this reason you should on the one hand pay attention to cleanliness in the apartment, on the other hand cover food or store it in the refrigerator at high temperatures.

2. Smelling trash can attract flies

Another unwanted attractant for the flying pests is the garbage can, which has a strong attraction on flies due to the odor development in summer. Especially if it contains perishable food, it should be emptied regularly to avoid luring flies into the apartment. In addition, the residual waste container should have a lid – and should be wiped out every now and then with a vinegar cleaner.

3. Dirty dishes in the kitchen

A third port of call for flies is dirty dishes piled up in the kitchen. Often leftover food sticks to it, giving off its scent and thus attracting pests. For this reason, plates, cups and cutlery should be rinsed or put in the dishwasher as soon as possible, and these should also be locked.

How do flies survive in winter?

Shortly before a cold snap, the fly makes for a lot of offspring. They lay their eggs in attics or basements and spend the winter there. As the temperature drops, the housefly becomes more and more sluggish and the metabolism slows down. A housefly normally only lives about four weeks. With this strategy it can survive for about three months in winter. If the temperatures rise above 10 degrees, the fly wakes up from its winter rigor.

4. Domestic or wild animal excrement

Flies are not only attracted to food, but also what left behind by cats or dogs. They settle on it and can also pick up pathogens that are dangerous to humans, which they then transmit. Cat owners should therefore empty and clean the litter box regularly.

5. Incorrect ventilation brings flies into the home

In most cases, flies enter the home through open windows. Of course, you shouldn’t completely do without ventilation in summer. However, it depends on the “how” and “when”. On the one hand, you should not ventilate in the evening or at night and at the same time illuminate the apartment brightly. Flies – and also other insects such as mosquitoes – are lured into the apartment by the light sources.

On the other hand, if you have the option, you should only open windows on a certain side of the apartment. Since flies like to stay in the sun, they often get in through the windows on the south side. It is better to ventilate on the shady side. And here the air is a bit cooler anyway.

Tip: A fly screen is an effective and gentle means of protecting yourself from insects. If you only have the opportunity to ventilate on the sunny side, you should consider the insect repellent.

causes of flies

6. Animal carcasses in the house or in the garden

If flies find a dead animal in which to lay their eggs, the population can explode in one fell swoop. This phenomenon is more common in the country than in the city – but there, too, there can be dead rats in the drainpipe , a marten in the attic or a dead bird in front of the window that has slammed against the pane. Animal carcasses are welcome breeding grounds that should be quickly tracked down and removed. The carcass is usually found by following its nose. If you cannot find what you are looking for, you should contact a professional pest controller.

How do you get rid of the causes of flies in your home?

If the flies keep coming back after eliminating the causes, some effective means can be used – even without chemicals. In this article you can read about how to drive away flies with certain plants and home remedies . The fruit or fruit flies are also particularly annoying , but there are also methods of combating the little pests. However, they should not be confused with the fungus gnats , which like to nestle in flower pots and swirl around them. You can get rid of these with a few tricks, for example with a match.

causes of flies

Did you know these 5 interesting facts about house flies?

1. House flies feed on liquid food

Flies tend to live on a diet that is based on liquids. Why? That’s the way they are. They lack the mouthparts needed to eat, so they have to drink. How do houseflies eat? – A housefly (or house fly) forms digestive juices and vomits them on solid food. These juices break the food into small pieces, allowing the flies to use their mouth parts (proboscis) to drink the meal.

2. House flies can taste with your feet

Just like butterflies, houseflies can taste food with their feet!  This is due to the taste receptors that the house flies have on their lower legs and feet. When a fly lands on a tasty meal, which can range from animal droppings to your lunch, it will often roam on top of its food to add flavor to its next meal before consuming it.

3. House flies defecate a lot … and everywhere!

And they don’t care where they do it either! As you know, houseflies like to live on liquid food. Because of this, their digestive systems work pretty quickly, which means they defecate quite often. It is speculated that every time they land they defecate, even on their next meal!

4. House flies can walk upside down

Let’s face it, you probably already knew that. A housefly’s anatomy allows it to walk and climb on most surfaces, whether horizontal, vertical, or even upside down. This is because each foot has two thick foot pads (called pulvilli) that contain tiny hairs. They produce a glue-like substance made from sugar and oils that gives them an excellent grip and is perfect for climbing any surface.

5. House flies can see behind them

That’s right, houseflies can see behind them, and they owe that to their amazing eyes. Unlike you and me, houseflies have compound eyes. These intricate eyes allow for a nearly 360 degree field of view, allowing them to see behind them. Unlike our eyes, a housefly’s eyes do not move. The ability to see in all directions helps them keep an eye out for sources of danger.


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